Accession Number : ADA137750

Title :   Spectroscopic Studies of the Products of the Reactions of Excited Noble-Gas Atoms.

Descriptive Note : Final scientific rept. 15 Mar 79-14 May 83,

Corporate Author : PITTSBURGH UNIV PA DEPT OF CHEMISTRY

Personal Author(s) : Golde,M F

PDF Url : ADA137750

Report Date : 29 Jun 1983

Pagination or Media Count : 56

Abstract : The products of the very rapid reactions of electronically-excited Ar, Kr and Xe atoms with several oxygen-, hydrogen- and halogen-containing compounds have been investigated using the saturation ion-current technique and emission and atomic resonance fluorescence spectroscopy in discharge-flow systems. New insight has been obtained into the mechanisms of the channels leading to chemiionization and noble-gas halide formation. Energy transfer leading to molecular dissociation is the major and often the dominant channel, with one or more atoms being eliminated in strong preference to elimination of molecular or electronically-excited fragments. For the excited noble gas atoms, the high quenching efficiency and dominance of dissociation and ionization channels are associated with the availability of accessible acceptor states of the quenching molecule, as revealed by its absorption spectrum. It is proposed that these efficient reactions occur by energy transfer at relatively long range with no major prior distortion of the quenching molecule. It is expected that this model should be directly applicable to the reactions of certain other excited species, which exhibit a similar correlation of quenching rate constants with the availability of acceptor states at the appropriate energy. (Author)

Descriptors :   *Spectroscopy, *Reaction kinetics, *Atoms, *Rare gases, Excitation, Energy transfer, Electronic states, Quick reaction, Resonance, Ionization, Argon, Xenon, Krypton, Oxygen compounds, Hydrogen compounds, Halogen compounds, Saturation, Ionic current, Emission spectroscopy, Atomic spectroscopy, Quenching, Dissociation

Subject Categories : Inorganic Chemistry
      Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE